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Focalize :: Focalize (v. t.) To bring to a focus; to focus; to concentrate.

Sunglow :: Sunglass (n.) A convex lens of glass for producing heat by converging the sun's rays into a focus.

Reticule :: Reticule (n..) A system of wires or lines in the focus of a telescope or other instrument; a reticle.

Latus Rectum :: Latus rectum () The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See Focus, and Parameter..

Emmetropia :: Emmetropia (n.) That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, an astigmatism..

Micrometer :: Micrometer (n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass..

Eccentricity :: Eccentricity (n.) The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis.

Focuses :: Focuses (pl. ) of Focu.

Aberration :: Aberration (n.) The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus..

Parabola :: Parabola (n.) A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus..

Focus :: Focus (n.) A central point; a point of concentration.

Myopia :: Myopia (n.) Nearsightedness; shortsightedness; a condition of the eye in which the rays from distant object are brought to a focus before they reach the retina, and hence form an indistinct image; while the rays from very near objects are normally converged so as to produce a distinct image. It is corrected by the use of a concave lens..

Focal :: Focal (a.) Belonging to,or concerning, a focus; as, a focal point..

Focusing :: Focusing (p. pr. & vb. n.) of Focu.

Convergent :: Convergent (a.) tending to one point of focus; tending to approach each other; converging.

Polar :: Polar (n.) The right line drawn through the two points of contact of the two tangents drawn from a given point to a given conic section. The given point is called the pole of the line. If the given point lies within the curve so that the two tangents become imaginary, there is still a real polar line which does not meet the curve, but which possesses other properties of the polar. Thus the focus and directrix are pole and polar. There are also poles and polar curves to curves of higher degree th

Focus :: Focus (v. t.) To bring to a focus; to focalize; as, to focus a camera..

Focalization :: Focalization (n.) The act of focalizing or bringing to a focus, or the state of being focalized..

Focused :: Focused (imp. & p. p.) of Focu.

Concentre :: Concentre (v. t.) To draw or direct to a common center; to bring together at a focus or point, as two or more lines; to concentrate..

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